The Effect of Motorcycle Helmet Use on the Probability
of Fatality and the Severity of Head And Neck Injuries

Appendix A

D

qualitative variable; D = 1 if operator died as a result of injuries sustained in accident, D = 0 otherwise D = 0.048.

HS =

where N is the number of head injuries incurred.

NS =

where K is the number of neck injuries sustained.

K1 =

.5MV2, measured in foot pounds, where M (measured in slugs) = WT/g, where WT is the weight of the operator measured in pounds and g is the gravitational constant measured in ft/sec2. V is the crash speed of the motorcycle measured in ft/sec. K1 = 3506.33.

K2 =

.5MV2, measured in foot-pounds, where V is the relative velocity of the motorcycle and other vehicle. K2 = 3793.39.